Uri L’Tzedek is an example of the Jewish organisations which aim to reform prison systems. (Vision = create social justice guided by the Torah's values)
People from the religious community (e.g. a rabbi) who visit prisons to provide pastoral care for inmates who'd like it.
There are many Jewish chaplaincy services which dedicate their time to Jewish prisoners across the country
JEWISH CHAPLAINCY SERVICE EXAMPLE:
The Jewish Prison Chaplaincy Service, founded by Reverend Michael Binstock, a rabbi who's worked with Jewish prisoners since 1969.